1 /*
2 * SSL/TLS interface functions for OpenSSL - BoringSSL OCSP
3 * Copyright (c) 2004-2015, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9 #include "includes.h"
10
11 #include <openssl/ssl.h>
12 #include <openssl/err.h>
13 #include <openssl/x509v3.h>
14 #ifdef OPENSSL_IS_BORINGSSL
15 #include <openssl/asn1.h>
16 #include <openssl/asn1t.h>
17 #endif /* OPENSSL_IS_BORINGSSL */
18
19 #include "common.h"
20 #include "tls_openssl.h"
21
22
23 #ifdef OPENSSL_IS_BORINGSSL
24
tls_show_errors(int level,const char * func,const char * txt)25 static void tls_show_errors(int level, const char *func, const char *txt)
26 {
27 unsigned long err;
28
29 wpa_printf(level, "OpenSSL: %s - %s %s",
30 func, txt, ERR_error_string(ERR_get_error(), NULL));
31
32 while ((err = ERR_get_error())) {
33 wpa_printf(MSG_INFO, "OpenSSL: pending error: %s",
34 ERR_error_string(err, NULL));
35 }
36 }
37
38
39 /*
40 * CertID ::= SEQUENCE {
41 * hashAlgorithm AlgorithmIdentifier,
42 * issuerNameHash OCTET STRING, -- Hash of Issuer's DN
43 * issuerKeyHash OCTET STRING, -- Hash of Issuer's public key
44 * serialNumber CertificateSerialNumber }
45 */
46 typedef struct {
47 X509_ALGOR *hashAlgorithm;
48 ASN1_OCTET_STRING *issuerNameHash;
49 ASN1_OCTET_STRING *issuerKeyHash;
50 ASN1_INTEGER *serialNumber;
51 } CertID;
52
53 /*
54 * ResponseBytes ::= SEQUENCE {
55 * responseType OBJECT IDENTIFIER,
56 * response OCTET STRING }
57 */
58 typedef struct {
59 ASN1_OBJECT *responseType;
60 ASN1_OCTET_STRING *response;
61 } ResponseBytes;
62
63 /*
64 * OCSPResponse ::= SEQUENCE {
65 * responseStatus OCSPResponseStatus,
66 * responseBytes [0] EXPLICIT ResponseBytes OPTIONAL }
67 */
68 typedef struct {
69 ASN1_ENUMERATED *responseStatus;
70 ResponseBytes *responseBytes;
71 } OCSPResponse;
72
73 ASN1_SEQUENCE(ResponseBytes) = {
74 ASN1_SIMPLE(ResponseBytes, responseType, ASN1_OBJECT),
75 ASN1_SIMPLE(ResponseBytes, response, ASN1_OCTET_STRING)
76 } ASN1_SEQUENCE_END(ResponseBytes);
77
78 ASN1_SEQUENCE(OCSPResponse) = {
79 ASN1_SIMPLE(OCSPResponse, responseStatus, ASN1_ENUMERATED),
80 ASN1_EXP_OPT(OCSPResponse, responseBytes, ResponseBytes, 0)
81 } ASN1_SEQUENCE_END(OCSPResponse);
82
83 IMPLEMENT_ASN1_FUNCTIONS(OCSPResponse);
84
85 /*
86 * ResponderID ::= CHOICE {
87 * byName [1] Name,
88 * byKey [2] KeyHash }
89 */
90 typedef struct {
91 int type;
92 union {
93 X509_NAME *byName;
94 ASN1_OCTET_STRING *byKey;
95 } value;
96 } ResponderID;
97
98 /*
99 * RevokedInfo ::= SEQUENCE {
100 * revocationTime GeneralizedTime,
101 * revocationReason [0] EXPLICIT CRLReason OPTIONAL }
102 */
103 typedef struct {
104 ASN1_GENERALIZEDTIME *revocationTime;
105 ASN1_ENUMERATED *revocationReason;
106 } RevokedInfo;
107
108 /*
109 * CertStatus ::= CHOICE {
110 * good [0] IMPLICIT NULL,
111 * revoked [1] IMPLICIT RevokedInfo,
112 * unknown [2] IMPLICIT UnknownInfo }
113 */
114 typedef struct {
115 int type;
116 union {
117 ASN1_NULL *good;
118 RevokedInfo *revoked;
119 ASN1_NULL *unknown;
120 } value;
121 } CertStatus;
122
123 /*
124 * SingleResponse ::= SEQUENCE {
125 * certID CertID,
126 * certStatus CertStatus,
127 * thisUpdate GeneralizedTime,
128 * nextUpdate [0] EXPLICIT GeneralizedTime OPTIONAL,
129 * singleExtensions [1] EXPLICIT Extensions OPTIONAL }
130 */
131 typedef struct {
132 CertID *certID;
133 CertStatus *certStatus;
134 ASN1_GENERALIZEDTIME *thisUpdate;
135 ASN1_GENERALIZEDTIME *nextUpdate;
136 STACK_OF(X509_EXTENSION) *singleExtensions;
137 } SingleResponse;
138
139 /*
140 * ResponseData ::= SEQUENCE {
141 * version [0] EXPLICIT Version DEFAULT v1,
142 * responderID ResponderID,
143 * producedAt GeneralizedTime,
144 * responses SEQUENCE OF SingleResponse,
145 * responseExtensions [1] EXPLICIT Extensions OPTIONAL }
146 */
147 typedef struct {
148 ASN1_INTEGER *version;
149 ResponderID *responderID;
150 ASN1_GENERALIZEDTIME *producedAt;
151 STACK_OF(SingleResponse) *responses;
152 STACK_OF(X509_EXTENSION) *responseExtensions;
153 } ResponseData;
154
155 /*
156 * BasicOCSPResponse ::= SEQUENCE {
157 * tbsResponseData ResponseData,
158 * signatureAlgorithm AlgorithmIdentifier,
159 * signature BIT STRING,
160 * certs [0] EXPLICIT SEQUENCE OF Certificate OPTIONAL }
161 */
162 typedef struct {
163 ResponseData *tbsResponseData;
164 X509_ALGOR *signatureAlgorithm;
165 ASN1_BIT_STRING *signature;
166 STACK_OF(X509) *certs;
167 } BasicOCSPResponse;
168
169 ASN1_SEQUENCE(CertID) = {
170 ASN1_SIMPLE(CertID, hashAlgorithm, X509_ALGOR),
171 ASN1_SIMPLE(CertID, issuerNameHash, ASN1_OCTET_STRING),
172 ASN1_SIMPLE(CertID, issuerKeyHash, ASN1_OCTET_STRING),
173 ASN1_SIMPLE(CertID, serialNumber, ASN1_INTEGER)
174 } ASN1_SEQUENCE_END(CertID);
175
176 ASN1_CHOICE(ResponderID) = {
177 ASN1_EXP(ResponderID, value.byName, X509_NAME, 1),
178 ASN1_EXP(ResponderID, value.byKey, ASN1_OCTET_STRING, 2)
179 } ASN1_CHOICE_END(ResponderID);
180
181 ASN1_SEQUENCE(RevokedInfo) = {
182 ASN1_SIMPLE(RevokedInfo, revocationTime, ASN1_GENERALIZEDTIME),
183 ASN1_EXP_OPT(RevokedInfo, revocationReason, ASN1_ENUMERATED, 0)
184 } ASN1_SEQUENCE_END(RevokedInfo);
185
186 ASN1_CHOICE(CertStatus) = {
187 ASN1_IMP(CertStatus, value.good, ASN1_NULL, 0),
188 ASN1_IMP(CertStatus, value.revoked, RevokedInfo, 1),
189 ASN1_IMP(CertStatus, value.unknown, ASN1_NULL, 2)
190 } ASN1_CHOICE_END(CertStatus);
191
192 ASN1_SEQUENCE(SingleResponse) = {
193 ASN1_SIMPLE(SingleResponse, certID, CertID),
194 ASN1_SIMPLE(SingleResponse, certStatus, CertStatus),
195 ASN1_SIMPLE(SingleResponse, thisUpdate, ASN1_GENERALIZEDTIME),
196 ASN1_EXP_OPT(SingleResponse, nextUpdate, ASN1_GENERALIZEDTIME, 0),
197 ASN1_EXP_SEQUENCE_OF_OPT(SingleResponse, singleExtensions,
198 X509_EXTENSION, 1)
199 } ASN1_SEQUENCE_END(SingleResponse);
200
201 ASN1_SEQUENCE(ResponseData) = {
202 ASN1_EXP_OPT(ResponseData, version, ASN1_INTEGER, 0),
203 ASN1_SIMPLE(ResponseData, responderID, ResponderID),
204 ASN1_SIMPLE(ResponseData, producedAt, ASN1_GENERALIZEDTIME),
205 ASN1_SEQUENCE_OF(ResponseData, responses, SingleResponse),
206 ASN1_EXP_SEQUENCE_OF_OPT(ResponseData, responseExtensions,
207 X509_EXTENSION, 1)
208 } ASN1_SEQUENCE_END(ResponseData);
209
210 ASN1_SEQUENCE(BasicOCSPResponse) = {
211 ASN1_SIMPLE(BasicOCSPResponse, tbsResponseData, ResponseData),
212 ASN1_SIMPLE(BasicOCSPResponse, signatureAlgorithm, X509_ALGOR),
213 ASN1_SIMPLE(BasicOCSPResponse, signature, ASN1_BIT_STRING),
214 ASN1_EXP_SEQUENCE_OF_OPT(BasicOCSPResponse, certs, X509, 0)
215 } ASN1_SEQUENCE_END(BasicOCSPResponse);
216
217 IMPLEMENT_ASN1_FUNCTIONS(BasicOCSPResponse);
218
219 #define sk_SingleResponse_num(sk) \
220 sk_num(CHECKED_CAST(_STACK *, STACK_OF(SingleResponse) *, sk))
221
222 #define sk_SingleResponse_value(sk, i) \
223 ((SingleResponse *) \
224 sk_value(CHECKED_CAST(_STACK *, STACK_OF(SingleResponse) *, sk), (i)))
225
226
mem_bio_to_str(BIO * out)227 static char * mem_bio_to_str(BIO *out)
228 {
229 char *txt;
230 size_t rlen;
231 int res;
232
233 rlen = BIO_ctrl_pending(out);
234 txt = os_malloc(rlen + 1);
235 if (!txt) {
236 BIO_free(out);
237 return NULL;
238 }
239
240 res = BIO_read(out, txt, rlen);
241 BIO_free(out);
242 if (res < 0) {
243 os_free(txt);
244 return NULL;
245 }
246
247 txt[res] = '\0';
248 return txt;
249 }
250
251
generalizedtime_str(ASN1_GENERALIZEDTIME * t)252 static char * generalizedtime_str(ASN1_GENERALIZEDTIME *t)
253 {
254 BIO *out;
255
256 out = BIO_new(BIO_s_mem());
257 if (!out)
258 return NULL;
259
260 if (!ASN1_GENERALIZEDTIME_print(out, t)) {
261 BIO_free(out);
262 return NULL;
263 }
264
265 return mem_bio_to_str(out);
266 }
267
268
responderid_str(ResponderID * rid)269 static char * responderid_str(ResponderID *rid)
270 {
271 BIO *out;
272
273 out = BIO_new(BIO_s_mem());
274 if (!out)
275 return NULL;
276
277 switch (rid->type) {
278 case 0:
279 X509_NAME_print_ex(out, rid->value.byName, 0, XN_FLAG_ONELINE);
280 break;
281 case 1:
282 i2a_ASN1_STRING(out, rid->value.byKey, V_ASN1_OCTET_STRING);
283 break;
284 default:
285 BIO_free(out);
286 return NULL;
287 }
288
289 return mem_bio_to_str(out);
290 }
291
292
octet_string_str(ASN1_OCTET_STRING * o)293 static char * octet_string_str(ASN1_OCTET_STRING *o)
294 {
295 BIO *out;
296
297 out = BIO_new(BIO_s_mem());
298 if (!out)
299 return NULL;
300
301 i2a_ASN1_STRING(out, o, V_ASN1_OCTET_STRING);
302 return mem_bio_to_str(out);
303 }
304
305
integer_str(ASN1_INTEGER * i)306 static char * integer_str(ASN1_INTEGER *i)
307 {
308 BIO *out;
309
310 out = BIO_new(BIO_s_mem());
311 if (!out)
312 return NULL;
313
314 i2a_ASN1_INTEGER(out, i);
315 return mem_bio_to_str(out);
316 }
317
318
algor_str(X509_ALGOR * alg)319 static char * algor_str(X509_ALGOR *alg)
320 {
321 BIO *out;
322
323 out = BIO_new(BIO_s_mem());
324 if (!out)
325 return NULL;
326
327 i2a_ASN1_OBJECT(out, alg->algorithm);
328 return mem_bio_to_str(out);
329 }
330
331
extensions_str(const char * title,STACK_OF (X509_EXTENSION)* ext)332 static char * extensions_str(const char *title, STACK_OF(X509_EXTENSION) *ext)
333 {
334 BIO *out;
335
336 if (!ext)
337 return NULL;
338
339 out = BIO_new(BIO_s_mem());
340 if (!out)
341 return NULL;
342
343 if (!X509V3_extensions_print(out, title, ext, 0, 0)) {
344 BIO_free(out);
345 return NULL;
346 }
347 return mem_bio_to_str(out);
348 }
349
350
ocsp_resp_valid(ASN1_GENERALIZEDTIME * thisupd,ASN1_GENERALIZEDTIME * nextupd)351 static int ocsp_resp_valid(ASN1_GENERALIZEDTIME *thisupd,
352 ASN1_GENERALIZEDTIME *nextupd)
353 {
354 time_t now, tmp;
355
356 if (!ASN1_GENERALIZEDTIME_check(thisupd)) {
357 wpa_printf(MSG_DEBUG,
358 "OpenSSL: Invalid OCSP response thisUpdate");
359 return 0;
360 }
361
362 time(&now);
363 tmp = now + 5 * 60; /* allow five minute clock difference */
364 if (X509_cmp_time(thisupd, &tmp) > 0) {
365 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP response not yet valid");
366 return 0;
367 }
368
369 if (!nextupd)
370 return 1; /* OK - no limit on response age */
371
372 if (!ASN1_GENERALIZEDTIME_check(nextupd)) {
373 wpa_printf(MSG_DEBUG,
374 "OpenSSL: Invalid OCSP response nextUpdate");
375 return 0;
376 }
377
378 tmp = now - 5 * 60; /* allow five minute clock difference */
379 if (X509_cmp_time(nextupd, &tmp) < 0) {
380 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP response expired");
381 return 0;
382 }
383
384 if (ASN1_STRING_cmp(nextupd, thisupd) < 0) {
385 wpa_printf(MSG_DEBUG,
386 "OpenSSL: OCSP response nextUpdate before thisUpdate");
387 return 0;
388 }
389
390 /* Both thisUpdate and nextUpdate are valid */
391 return -1;
392 }
393
394
issuer_match(X509 * cert,X509 * issuer,CertID * certid)395 static int issuer_match(X509 *cert, X509 *issuer, CertID *certid)
396 {
397 X509_NAME *iname;
398 ASN1_BIT_STRING *ikey;
399 const EVP_MD *dgst;
400 unsigned int len;
401 unsigned char md[EVP_MAX_MD_SIZE];
402 ASN1_OCTET_STRING *hash;
403 char *txt;
404
405 dgst = EVP_get_digestbyobj(certid->hashAlgorithm->algorithm);
406 if (!dgst) {
407 wpa_printf(MSG_DEBUG,
408 "OpenSSL: Could not find matching hash algorithm for OCSP");
409 return -1;
410 }
411
412 iname = X509_get_issuer_name(cert);
413 if (!X509_NAME_digest(iname, dgst, md, &len))
414 return -1;
415 hash = ASN1_OCTET_STRING_new();
416 if (!hash)
417 return -1;
418 if (!ASN1_OCTET_STRING_set(hash, md, len)) {
419 ASN1_OCTET_STRING_free(hash);
420 return -1;
421 }
422
423 txt = octet_string_str(hash);
424 if (txt) {
425 wpa_printf(MSG_DEBUG, "OpenSSL: calculated issuerNameHash: %s",
426 txt);
427 os_free(txt);
428 }
429
430 if (ASN1_OCTET_STRING_cmp(certid->issuerNameHash, hash)) {
431 ASN1_OCTET_STRING_free(hash);
432 return -1;
433 }
434
435 ikey = X509_get0_pubkey_bitstr(issuer);
436 if (!ikey ||
437 !EVP_Digest(ikey->data, ikey->length, md, &len, dgst, NULL) ||
438 !ASN1_OCTET_STRING_set(hash, md, len)) {
439 ASN1_OCTET_STRING_free(hash);
440 return -1;
441 }
442
443 txt = octet_string_str(hash);
444 if (txt) {
445 wpa_printf(MSG_DEBUG, "OpenSSL: calculated issuerKeyHash: %s",
446 txt);
447 os_free(txt);
448 }
449
450 if (ASN1_OCTET_STRING_cmp(certid->issuerKeyHash, hash)) {
451 ASN1_OCTET_STRING_free(hash);
452 return -1;
453 }
454
455 ASN1_OCTET_STRING_free(hash);
456 return 0;
457 }
458
459
ocsp_find_signer(STACK_OF (X509)* certs,ResponderID * rid)460 static X509 * ocsp_find_signer(STACK_OF(X509) *certs, ResponderID *rid)
461 {
462 unsigned int i;
463 unsigned char hash[SHA_DIGEST_LENGTH];
464
465 if (rid->type == 0) {
466 /* byName */
467 return X509_find_by_subject(certs, rid->value.byName);
468 }
469
470 /* byKey */
471 if (rid->value.byKey->length != SHA_DIGEST_LENGTH)
472 return NULL;
473 for (i = 0; i < sk_X509_num(certs); i++) {
474 X509 *x = sk_X509_value(certs, i);
475
476 X509_pubkey_digest(x, EVP_sha1(), hash, NULL);
477 if (os_memcmp(rid->value.byKey->data, hash,
478 SHA_DIGEST_LENGTH) == 0)
479 return x;
480 }
481
482 return NULL;
483 }
484
485
check_ocsp_resp(SSL_CTX * ssl_ctx,SSL * ssl,X509 * cert,X509 * issuer,X509 * issuer_issuer)486 enum ocsp_result check_ocsp_resp(SSL_CTX *ssl_ctx, SSL *ssl, X509 *cert,
487 X509 *issuer, X509 *issuer_issuer)
488 {
489 const uint8_t *resp_data;
490 size_t resp_len;
491 OCSPResponse *resp;
492 int status;
493 ResponseBytes *bytes;
494 const u8 *basic_data;
495 size_t basic_len;
496 BasicOCSPResponse *basic;
497 ResponseData *rd;
498 char *txt;
499 int i, num;
500 unsigned int j, num_resp;
501 SingleResponse *matching_resp = NULL, *cmp_sresp;
502 enum ocsp_result result = OCSP_INVALID;
503 X509_STORE *store;
504 STACK_OF(X509) *untrusted = NULL, *certs = NULL, *chain = NULL;
505 X509_STORE_CTX ctx;
506 X509 *signer, *tmp_cert;
507 int signer_trusted = 0;
508 EVP_PKEY *skey;
509 int ret;
510 char buf[256];
511
512 txt = integer_str(X509_get_serialNumber(cert));
513 if (txt) {
514 wpa_printf(MSG_DEBUG,
515 "OpenSSL: Searching OCSP response for peer certificate serialNumber: %s", txt);
516 os_free(txt);
517 }
518
519 SSL_get0_ocsp_response(ssl, &resp_data, &resp_len);
520 if (resp_data == NULL || resp_len == 0) {
521 wpa_printf(MSG_DEBUG, "OpenSSL: No OCSP response received");
522 return OCSP_NO_RESPONSE;
523 }
524
525 wpa_hexdump(MSG_DEBUG, "OpenSSL: OCSP response", resp_data, resp_len);
526
527 resp = d2i_OCSPResponse(NULL, &resp_data, resp_len);
528 if (!resp) {
529 wpa_printf(MSG_INFO, "OpenSSL: Failed to parse OCSPResponse");
530 return OCSP_INVALID;
531 }
532
533 status = ASN1_ENUMERATED_get(resp->responseStatus);
534 if (status != 0) {
535 wpa_printf(MSG_INFO, "OpenSSL: OCSP responder error %d",
536 status);
537 return OCSP_INVALID;
538 }
539
540 bytes = resp->responseBytes;
541
542 if (!bytes ||
543 OBJ_obj2nid(bytes->responseType) != NID_id_pkix_OCSP_basic) {
544 wpa_printf(MSG_INFO,
545 "OpenSSL: Could not find BasicOCSPResponse");
546 return OCSP_INVALID;
547 }
548
549 basic_data = ASN1_STRING_data(bytes->response);
550 basic_len = ASN1_STRING_length(bytes->response);
551 wpa_hexdump(MSG_DEBUG, "OpenSSL: BasicOCSPResponse",
552 basic_data, basic_len);
553
554 basic = d2i_BasicOCSPResponse(NULL, &basic_data, basic_len);
555 if (!basic) {
556 wpa_printf(MSG_INFO,
557 "OpenSSL: Could not parse BasicOCSPResponse");
558 OCSPResponse_free(resp);
559 return OCSP_INVALID;
560 }
561
562 rd = basic->tbsResponseData;
563
564 if (basic->certs) {
565 untrusted = sk_X509_dup(basic->certs);
566 if (!untrusted)
567 goto fail;
568
569 num = sk_X509_num(basic->certs);
570 for (i = 0; i < num; i++) {
571 X509 *extra_cert;
572
573 extra_cert = sk_X509_value(basic->certs, i);
574 X509_NAME_oneline(X509_get_subject_name(extra_cert),
575 buf, sizeof(buf));
576 wpa_printf(MSG_DEBUG,
577 "OpenSSL: BasicOCSPResponse cert %s", buf);
578
579 if (!sk_X509_push(untrusted, extra_cert)) {
580 wpa_printf(MSG_DEBUG,
581 "OpenSSL: Could not add certificate to the untrusted stack");
582 }
583 }
584 }
585
586 store = SSL_CTX_get_cert_store(ssl_ctx);
587 if (issuer) {
588 if (X509_STORE_add_cert(store, issuer) != 1) {
589 tls_show_errors(MSG_INFO, __func__,
590 "OpenSSL: Could not add issuer to certificate store");
591 }
592 certs = sk_X509_new_null();
593 if (certs) {
594 tmp_cert = X509_dup(issuer);
595 if (tmp_cert && !sk_X509_push(certs, tmp_cert)) {
596 tls_show_errors(
597 MSG_INFO, __func__,
598 "OpenSSL: Could not add issuer to OCSP responder trust store");
599 X509_free(tmp_cert);
600 sk_X509_free(certs);
601 certs = NULL;
602 }
603 if (certs && issuer_issuer) {
604 tmp_cert = X509_dup(issuer_issuer);
605 if (tmp_cert &&
606 !sk_X509_push(certs, tmp_cert)) {
607 tls_show_errors(
608 MSG_INFO, __func__,
609 "OpenSSL: Could not add issuer's issuer to OCSP responder trust store");
610 X509_free(tmp_cert);
611 }
612 }
613 }
614 }
615
616 signer = ocsp_find_signer(certs, rd->responderID);
617 if (!signer)
618 signer = ocsp_find_signer(untrusted, rd->responderID);
619 else
620 signer_trusted = 1;
621 if (!signer) {
622 wpa_printf(MSG_DEBUG,
623 "OpenSSL: Could not find OCSP signer certificate");
624 goto fail;
625 }
626
627 skey = X509_get_pubkey(signer);
628 if (!skey) {
629 wpa_printf(MSG_DEBUG,
630 "OpenSSL: Could not get OCSP signer public key");
631 goto fail;
632 }
633 if (ASN1_item_verify(ASN1_ITEM_rptr(ResponseData),
634 basic->signatureAlgorithm, basic->signature,
635 basic->tbsResponseData, skey) <= 0) {
636 wpa_printf(MSG_DEBUG,
637 "OpenSSL: BasicOCSPResponse signature is invalid");
638 goto fail;
639 }
640
641 X509_NAME_oneline(X509_get_subject_name(signer), buf, sizeof(buf));
642 wpa_printf(MSG_DEBUG,
643 "OpenSSL: Found OCSP signer certificate %s and verified BasicOCSPResponse signature",
644 buf);
645
646 if (!X509_STORE_CTX_init(&ctx, store, signer, untrusted))
647 goto fail;
648 X509_STORE_CTX_set_purpose(&ctx, X509_PURPOSE_OCSP_HELPER);
649 ret = X509_verify_cert(&ctx);
650 chain = X509_STORE_CTX_get1_chain(&ctx);
651 X509_STORE_CTX_cleanup(&ctx);
652 if (ret <= 0) {
653 wpa_printf(MSG_DEBUG,
654 "OpenSSL: Could not validate OCSP signer certificate");
655 goto fail;
656 }
657
658 if (!chain || sk_X509_num(chain) <= 0) {
659 wpa_printf(MSG_DEBUG, "OpenSSL: No OCSP signer chain found");
660 goto fail;
661 }
662
663 if (!signer_trusted) {
664 X509_check_purpose(signer, -1, 0);
665 if ((signer->ex_flags & EXFLAG_XKUSAGE) &&
666 (signer->ex_xkusage & XKU_OCSP_SIGN)) {
667 wpa_printf(MSG_DEBUG,
668 "OpenSSL: OCSP signer certificate delegation OK");
669 } else {
670 tmp_cert = sk_X509_value(chain, sk_X509_num(chain) - 1);
671 if (X509_check_trust(tmp_cert, NID_OCSP_sign, 0) !=
672 X509_TRUST_TRUSTED) {
673 wpa_printf(MSG_DEBUG,
674 "OpenSSL: OCSP signer certificate not trusted");
675 result = OCSP_NO_RESPONSE;
676 goto fail;
677 }
678 }
679 }
680
681 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP version: %lu",
682 ASN1_INTEGER_get(rd->version));
683
684 txt = responderid_str(rd->responderID);
685 if (txt) {
686 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP responderID: %s",
687 txt);
688 os_free(txt);
689 }
690
691 txt = generalizedtime_str(rd->producedAt);
692 if (txt) {
693 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP producedAt: %s",
694 txt);
695 os_free(txt);
696 }
697
698 num_resp = sk_SingleResponse_num(rd->responses);
699 if (num_resp == 0) {
700 wpa_printf(MSG_DEBUG,
701 "OpenSSL: No OCSP SingleResponse within BasicOCSPResponse");
702 result = OCSP_NO_RESPONSE;
703 goto fail;
704 }
705 cmp_sresp = sk_SingleResponse_value(rd->responses, 0);
706 for (j = 0; j < num_resp; j++) {
707 SingleResponse *sresp;
708 CertID *cid1, *cid2;
709
710 sresp = sk_SingleResponse_value(rd->responses, j);
711 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP SingleResponse %u/%u",
712 j + 1, num_resp);
713
714 txt = algor_str(sresp->certID->hashAlgorithm);
715 if (txt) {
716 wpa_printf(MSG_DEBUG,
717 "OpenSSL: certID hashAlgorithm: %s", txt);
718 os_free(txt);
719 }
720
721 txt = octet_string_str(sresp->certID->issuerNameHash);
722 if (txt) {
723 wpa_printf(MSG_DEBUG,
724 "OpenSSL: certID issuerNameHash: %s", txt);
725 os_free(txt);
726 }
727
728 txt = octet_string_str(sresp->certID->issuerKeyHash);
729 if (txt) {
730 wpa_printf(MSG_DEBUG,
731 "OpenSSL: certID issuerKeyHash: %s", txt);
732 os_free(txt);
733 }
734
735 txt = integer_str(sresp->certID->serialNumber);
736 if (txt) {
737 wpa_printf(MSG_DEBUG,
738 "OpenSSL: certID serialNumber: %s", txt);
739 os_free(txt);
740 }
741
742 switch (sresp->certStatus->type) {
743 case 0:
744 wpa_printf(MSG_DEBUG, "OpenSSL: certStatus: good");
745 break;
746 case 1:
747 wpa_printf(MSG_DEBUG, "OpenSSL: certStatus: revoked");
748 break;
749 default:
750 wpa_printf(MSG_DEBUG, "OpenSSL: certStatus: unknown");
751 break;
752 }
753
754 txt = generalizedtime_str(sresp->thisUpdate);
755 if (txt) {
756 wpa_printf(MSG_DEBUG, "OpenSSL: thisUpdate: %s", txt);
757 os_free(txt);
758 }
759
760 if (sresp->nextUpdate) {
761 txt = generalizedtime_str(sresp->nextUpdate);
762 if (txt) {
763 wpa_printf(MSG_DEBUG, "OpenSSL: nextUpdate: %s",
764 txt);
765 os_free(txt);
766 }
767 }
768
769 txt = extensions_str("singleExtensions",
770 sresp->singleExtensions);
771 if (txt) {
772 wpa_printf(MSG_DEBUG, "OpenSSL: %s", txt);
773 os_free(txt);
774 }
775
776 cid1 = cmp_sresp->certID;
777 cid2 = sresp->certID;
778 if (j > 0 &&
779 (OBJ_cmp(cid1->hashAlgorithm->algorithm,
780 cid2->hashAlgorithm->algorithm) != 0 ||
781 ASN1_OCTET_STRING_cmp(cid1->issuerNameHash,
782 cid2->issuerNameHash) != 0 ||
783 ASN1_OCTET_STRING_cmp(cid1->issuerKeyHash,
784 cid2->issuerKeyHash) != 0)) {
785 wpa_printf(MSG_DEBUG,
786 "OpenSSL: Different OCSP response issuer information between SingleResponse values within BasicOCSPResponse");
787 goto fail;
788 }
789
790 if (!matching_resp && issuer &&
791 ASN1_INTEGER_cmp(sresp->certID->serialNumber,
792 X509_get_serialNumber(cert)) == 0 &&
793 issuer_match(cert, issuer, sresp->certID) == 0) {
794 wpa_printf(MSG_DEBUG,
795 "OpenSSL: This response matches peer certificate");
796 matching_resp = sresp;
797 }
798 }
799
800 txt = extensions_str("responseExtensions", rd->responseExtensions);
801 if (txt) {
802 wpa_printf(MSG_DEBUG, "OpenSSL: %s", txt);
803 os_free(txt);
804 }
805
806 if (!matching_resp) {
807 wpa_printf(MSG_DEBUG,
808 "OpenSSL: Could not find OCSP response that matches the peer certificate");
809 result = OCSP_NO_RESPONSE;
810 goto fail;
811 }
812
813 if (!ocsp_resp_valid(matching_resp->thisUpdate,
814 matching_resp->nextUpdate)) {
815 wpa_printf(MSG_DEBUG,
816 "OpenSSL: OCSP response not valid at this time");
817 goto fail;
818 }
819
820 if (matching_resp->certStatus->type == 1) {
821 wpa_printf(MSG_DEBUG,
822 "OpenSSL: OCSP response indicated that the peer certificate has been revoked");
823 result = OCSP_REVOKED;
824 goto fail;
825 }
826
827 if (matching_resp->certStatus->type != 0) {
828 wpa_printf(MSG_DEBUG,
829 "OpenSSL: OCSP response did not indicate good status");
830 result = OCSP_NO_RESPONSE;
831 goto fail;
832 }
833
834 /* OCSP response indicated the certificate is good. */
835 result = OCSP_GOOD;
836 fail:
837 sk_X509_pop_free(chain, X509_free);
838 sk_X509_free(untrusted);
839 sk_X509_pop_free(certs, X509_free);
840 BasicOCSPResponse_free(basic);
841 OCSPResponse_free(resp);
842
843 return result;
844 }
845
846 #endif /* OPENSSL_IS_BORINGSSL */
847
